fix: missing MapEventCameraIdle, MapEventStartMoveCamera events on iOS (#428)

This PR fixes #422 issue.

---------

Co-authored-by: Joscha Eckert <[email protected]>

Author: BartoszStasiurka

maplibre_ios/ios/maplibre_ios/Sources/maplibre_ios/MapViewDelegate.swift

@@ -192,6 +192,26 @@ class MapLibreView: NSObject, FlutterPlatformView, MLNMapViewDelegate,
     true
   }
 
+  // MLNMapViewDelegate method called when camera is about to start changing
+  func mapView(_: MLNMapView, regionWillChangeWith reason: MLNCameraChangeReason, animated _: Bool) {
+    let changeReason: CameraChangeReason = switch reason {
+    case .gestureOneFingerZoom, .gesturePan, .gesturePinch, .gestureRotate, .gestureTilt,
+         .gestureZoomIn, .gestureZoomOut, .transitionCancelled:
+      .apiGesture
+    case .programmatic:
+      .apiAnimation
+    default:
+      .developerAnimation
+    }
+
+    _flutterApi.onStartMoveCamera(reason: changeReason) { _ in }
+  }
+
+  /// MLNMapViewDelegate method called when camera has finished changing
+  func mapView(_: MLNMapView, regionDidChangeWith _: MLNCameraChangeReason, animated _: Bool) {
+    _flutterApi.onCameraIdle { (_: Result<Void, PigeonError>) in }
+  }
+
   // MLNMapViewDelegate method called when map has finished loading
   func mapView(_ mapView: MLNMapView, didFinishLoading _: MLNStyle) {
     // setCamera() can only be used after the map did finish loading